Map Function Inside Map Function Javascript

Published may 16, 2021 ∙ updated may 2, 2022. A use case for map in react. Let newarr = oldarr.map ( (val, index, arr) => { // return element to new array });

This is what makes _.map () more powerful. In the above example, the map() function adds the result items to a new array called “newarrprice”. I did a console.log on this inside my map() function and it was infact refering to the window object, but i can't seem to find a way to change that.

A new array is then returned.

The result of this function is then moved into its own array. You can’t use it on objects, so if you have an object nested inside an array you can use.map on the outer array but not the inner object. The index is used inside map () method to state the position of each element in an array, but it doesn’t change the original array. The array map () function in javascript is used to create a new array with a given array, by executing a.